How are Spongy Moth Populations Suppressed?

The aerial application of Btk (Bacillus thuringiensis variety kurstaki) is used to reduce high populations of  Spongy Moth caterpillars at sites that meet MDA requirements for spraying.  Bt is a naturally occurring bacterium found in the soil and is not harmful to pets, birds, fish, wildlife, plants, beneficial insects, and humans.  Bt is applied when the caterpillars are young (usually in May) to insure the greatest impact in reducing numbers.  Alternative mechanical techniques, such as tree banding and egg mass scraping, also reduce caterpillar numbers.  The Suppression Program recommends the use of a combination of methods.

Show All Answers

1. What is Spongy Moth and the impacts?
2. What are the goals of suppression efforts?
3. How are Spongy Moth Populations Suppressed?
4. What is the Spongy Moth Cycle?
5. How do Spongy Moth travel?
6. How do I know if I have the Spongy Moth?
7. What does Spongy Moth damage look like?
8. What happens when trees are defoliated?
9. Should I report a Spongy Moth Infestation?
10. Where is the Macomb MSU Extension?